The following table lists the instruction's hexadecimal and Microsoft Intermediate Language (MSIL) assembly format, along with a brief reference summary:

Format

Assembly Format

Description

FE 0F

localloc

Allocate space from the local heap.

The stack transitional behavior, in sequential order, is:

The number of bytes to be allocated is pushed onto the stack.

The number of bytes is popped from the stack; an amount of memory corresponding to the size is allocated from the local heap.

A pointer to the first byte of the allocated memory is pushed onto the stack.

The localloc instruction allocates size (type natural unsigned int) bytes from the local dynamic memory pool and returns the address (a transient pointer, type *) of the first allocated byte. The block of memory returned is initialized to 0 only if the initialize flag on the method is true. When the current method executes a Ret, the local memory pool is made available for reuse.

The resulting address is aligned so that any primitive data type can be stored there using the stind instructions (such as Stind_I4) and loaded using the ldind instructions (such as Ldind_I4).

The localloc instruction cannot occur within a filter, catch, finally, or fault block.